Oil well swal



May 7, 1935.

\ B* E, TYLER OIL WELL SWAB Filed F'b. 14, 1955 y ,34 irl/.56 @#57 S 39INI/ENTOR.` \40 Beer E. NLE/z ATTORNEYS.

' In the drawing Patented May 7, 1935 v UNITED STATES PATENT OFFICE2,000,109 i 011 WELL SWAE Bert E. Tyler, Los Angeles, Calif.,Application February 14, 1933, Serial No. 656,669 Z Claims. (Cl. 309-23)This ,invention relates to an oil well tool', and.

particularly pertains to a well swab.

In oil eld production operations it sometimes occurs that the well doesnot ow freely, although its potential production is greater than thecapacity of a regular oil well pumping unit. In such cases it isoften'possible to obtain maximum production by a swabbing operation. Theefficiency of a well swab is in direct proportion to the ability of theswab to form a tight t between its packing elements and the surroundingwall of the well casing, and to maintain this fit irrespective of wearupon the packing elements. It is the principal object of the presentinvention, therefore, to provide a well swab which may be easily loweredinto a well casing, and which operates by mechanical and hydrostaticpressure means to maintain a suitable packed relation with the casing atall times.

The present invention contemplates theprovision of a well swab having atubular central mandrel upon which is mounted a Aplurality of packingunits, said under mechanical pressure to expand against the wall of awell casing, and being provided with means to cause varying degrees ofhydrostatic pressure to be imposed upon the successive packing elementsto expand them into the casing so as to obtain a maximum swabbing effecteven though certain of the packing units should become damaged to anextent where they would be practically useless.

The invention is -described by way of example in the accompanyingdrawing, in which:

Figure 1 is a view in central vertical section and elevation showing thewell swab in position within a section of well casing.

Fig. 2 is a view in transverse section through the well swab as takentransversely of the packing cap and structure as shown in Figure 1, andas indicating the manner in which hydrostatic pressure may be imposedupon the packing element.

Referring more particularly to the drawing, I0 indicates a well casinginto which a well swab II is introduced. The depth at which the swab isoperated is determined by the condition of the well and the level of thefluid within the casing. the swab II is shown as provided with a toppacking rubber I2 and a lower packing rubber I3. The upper rubber ismounted upon an upper section I4 oi a tubular mandrel, and the lowerrubber is mounted upon the lower section I5 of a tubular mandrel. Saidmandrel sections abutting against `each other at I6 and being threadedinto the opposite ends of a center packunits being normally set ing cupI1. at its upper member I9.

upper packing rubber an oppositely disposed cylindric the uppercylindrical extension 2l rubber I3. The packing rubbers as are formed attheir oppos bore receiving a cylindrical extension 20 of the cup membera cylindrical cup has a center I2. The cup-member I9 has al borereceiving `o the packing thus described ite ends with longitudinallyaligned cylindrical extensions 20 and 2|.

The intermediate portion of each of the packing rubbers is indicated at22 as beingy of relatively large diameter and is preferably formed withits largest diameter intermedia surfaces of the packing members eter ofthe portion 22 this contact may be te its ends. The outer are convexednt the largest diamis intended to contact with tubular shank 24 and withwhich section I4 is preferably forme central threaded c threaded entubular pass with the upper opened end of I4 and is provided with aplura inclined eduction fluid may fl upper cup has a ceive the upper I4..A central and outwardly through which upper end oi joint 28 whichthreaded onto the tion I5. The

rubber the clined face 32 which enlarged central portions 2 that bytightening will be seen 3l against the adjacent ends bers I2 and I3,longitudin bly engage the wall of t of the mandrel sections of the inthe center cup I1 as by welding.

The lower mandrel section I5 pro d integr/al.

ow from well casing above the swab. The the shank 2 may be threaded into29 of a polish rod 30, or other suitable suspending element. The lowerpacking at its lower .end with a lower c lower end of various cups I8,

In order that de, the upper exprovided with an r end of the the mandrelThis pening to red of mandrel section ageway 25 registers the mandrelsection lity of upwardly ports 26 and 21 the mandrel 4 is formed with apm the box joint I3 is provided up 3l which is mandrel secy I9, 23 and3I'are` inwardly in- 2. In this manner 1t the cups 23 and packing rubalpressure may be exbody of rubber occurring between the opposed cups,thus the rubber and distended to forcihe casing. Either or both I4 andI5 may be secured jects through the threaded opening in the end wall ofthe lower cup :Hand into a threaded opening by a cylindria check Valvestrainer portion of the check valve seat is formed desired. ttenti n isdirected to the fact that the upper interior of the casing IU and achamber 43 which 1l occur within the cups between their end walls andthe end faces of the packing rubbers I2 and within the fluid of thewell. Prior to lowering the swab into the well thecups 23 and 3| havebeen properly tightened to expand the packing rubbers l2 and I3 to fitwithin .the well casing. As

through the ducts 43 of the cups Attention is directed to the fact thatwnen the device is assembled, the joint between the adjacent ends of themandrel sections I4 and occur at I6 within the center cup upper end ofI4 into the passageway 25 then outwardly through the into the casing.

of the shank 24, and ducts 25 and 21 swab is drawn upwardly, this liquidwill be lifted from the Well.

As has been previously explained, some occawell casing, though thepacking rubbers should become inoperative.

While I have invention as now known to me, it will be under- Having thusdescribed my invention, what I claim and desire to secure by LettersPatent is:-

Y. 1. A packing structure tudinally compress the expanding member andremotas a HsiuNs.

wardly to form a seal with the seat within the cups.

2. A packing structure adapted to be expanded into a cylindrical Vnembercomprising a, central cylindrical member upon which a tubulardeformablepackig' element ismmounted, said element having-an" enlargedcentral body portion adapted to contact with the surface of the memberinto which it is expanded, and reduced cyl- 10 inder ends, said endshaving end faces formed with a circumferentially extending V-shapedgroove,

cylindrical cups at the opposite end of said packer and receiving theends thereof, said cups being secured to the cylindrical member passingthrough the packer, whereby a compression force between the cups willtend to expand the packing, `said. cups,be.ing icrmedi .witnfiggtsf lcommunicating y withthc groovesintheendofrthe packing Whereby the fluidbeing packedmwll-naid in producing compression the packing.

